Dumplings

With fresh, whole milk.“Sweet milk” just means fresh whole milk. The term dates from when it was common to churn your own butter, which meant the house had milk in various states of culture. There are actually quite a few recipes that call for sour milk, though these days, we generally use buttermilk. (Which is sort-of-sour milk, technically, but we’re really getting off-topic.)

Definitioner

sour milk

Milk that has either started to turn or has fully turned sour (as in, expired). Imparts a tangy flavor to the end product in baked goods. Substitute buttermilk if you find you can't bring yourself to intentionally use sour milk.